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I'm pretty sure most portable ACs sold in Europe these days are R290 (propane) which has a GWP of about 1/14th of CO2, so for those that's no longer much of a concern.

R290 has a GWP of 3.3, so that's 3.3x worse than CO2 with a GOP of 1. Which makes sense, because when propane breaks down it usually breaks down to CO2.

Thanks for sharing that portable AC's in Europe are R290, I don't think that's super common in the US. But I'm open to being shown wrong on that!

This is not true anymore. Most systems are switching to less dangerous refrigerants.

Can't you get R744 (CO2) AC systems these days?

I've yet to see many small portable ac units running R744 at least in the US. It requires really high pressures to run well.